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This paper presents an efficient method for online testing of NoC switches. This method deals with control faults of NoC switches; i.e. the routing faults which cause NoC packets to be sent to output ports not intended to. A high level fault model has been proposed in this paper to model switch routing faults. The proposed method is evaluated by fault simulation that is based on our high-level fault model. This simulation and evaluation environment is modeled at the transaction level in VHDL.